Genomic Constitution of Taxa in Triticeae

The table below presents genomic information on specimens in all the genera EXCEPT Triticum, Aegilops, and Amblyopryum which is on another page. The symbols used follow the recommendations of Wang et al. (1994). Notice that these authors recommended using E, not J, for the genome in T. elongatum and its allies (Thinopyrum as used on this web site), in order be consistent with previous use by wheat breeders. For information on this page I am indebted to Richard Wang and Bjorn Salomon. The information on the Triticum-Aegilops-Amblyopyrum page came from Richard Wang and Michael van Slageren.

The table below shows the genomic constitution of individual taxa sorted by genomes within affiliated groups of genera. For further information about these records, click here. To move to groups, use the following links: St genome species, E genome species, N genome species. Because of the way in which the species are grouped, it is impossible to make this as easy to use as might be desirable. One day I shall split it into multiple tables, each table including all taxa known to have a particular genome. When this happens, species polygenomic species will appear in more than one table.

RECENT WORK suggests that some of the constitutions reported on this page are not corrrect. Whether this is because the taxonomy of the species involved is not well understood or because the methods being used differ is not clear.

The last column contains the generic name that should be used if adopting the principle of genomic classification. It is based on the recommendations of Yen et al. . 2005, with one modification - the use of Thinopyrum rather than Lophopyrum when the two genera are combined in order to conform to the requiremens of the International Code of Botanical Nomenclature. Among the the principles Yen et al. followed in making their recommendations was that the treatment of genera should reflect both phylogenetic relationships and convenience and that force of habit should be considered, whenever possible, to avoid chaos. They acknowledge that their system is incomplete and does not resolve all problems. Prof. Yen sent me (Nov. 17, 2005) a working synopsis of Roegneria, for which I thank him. That information is being incorporated into the page for Roegneria. This page is designed to show which taxa have been genomically characterized and where the information was published.

Pseudoroegneria pertenuis: Assadi (1994, 1995) identified plants from Azerbaijan and those grown from the US accessions PI 40328 and 401330 as Elymus pertenuis = Pseudoroegneria pertenuis. Yen et al. . (2005) concluded that plants grown from seed of the two accessions were not the same as the type of pertenuis but belonged to a previously undescribed species, which they placed in their new genus Douglasdeweya as D. wangii. The accessions were originally identified as belonging to Pseudoreogneria tauri. According to Yen et al. . (2005), the genomic constitution of the pertenuis taxon is unknown.